title: Identification of a new potential Cd-hyperaccumulator Solanum photeinocarpum by soil seed bank-metal concentration gradient method.
abstract: A new method, soil seed bank-metal concentration gradient method was used to screen for heavy metal hyperaccumulators, and Solanum photeinocarpum was found to be a potential Cd-hyperaccumulator. The chlorophyll content and photosynthetic rate of S. photeinocarpum were not affected by Cd pollution, while leaf stomas and transpiration rate were significantly decreased by more than 60 mg kg(-1) Cd, and leaf water use efficiency and shoot water content were significantly increased by more than 60 or 100 mg kg(-1) Cd, respectively. In the seed bank-Cd concentration gradient experiment, the shoot biomass of S. photeinocarpum showed no significant reduction with soil Cd treatment as high as 100 mg kg(-1), but the root biomass was significantly reduced by more than 60 mg kg(-1) Cd contamination. Plant tissues accumulated 544, 132 and 158 mg kg(-1) Cd in roots, stems and leaves, respectively, and extracted 157 and 195 μg Cd plant(-1) in roots and shoots at 100 mg kg(-1) Cd in soil, respectively. In the transplanting-Cd concentration gradient experiment, plant shoot biomass and root biomass were unaffected by soil Cd as high as 60 mg kg(-1). Plant tissues accumulated 473, 215 and 251 mg kg(-1) Cd in roots, stems and leaves, respectively, and extracted 176 and 787 μg Cd plant(-1) in roots and shoots at 60 mg kg(-1) soil Cd, respectively. Soil seed bank-metal concentration gradient method could be an effective method for the screening of hyperaccumulators.
authors.affiliation: South China Botanical Garden, The Chinese Academy of Sciences, Guangzhou 510650, China.
authors.forename: Xingfeng
authors.initials: X
authors.lastname: Zhang
authors.forename: Hanping
authors.initials: H
authors.lastname: Xia
authors.forename: Zhi'an
authors.initials: Z
authors.lastname: Li
authors.forename: Ping
authors.initials: P
authors.lastname: Zhuang
authors.forename: Bo
authors.initials: B
authors.lastname: Gao
mesh_terms: D001673:Biodegradation, Environmental; D018533:Biomass; D002104:Cadmium / Q000493:pharmacokinetics*; D002734:Chlorophyll; D007700:Kinetics; D008722:Methods; D010788:Photosynthesis; D018514:Plant Structures; D012989:Soil Pollutants / Q000493:pharmacokinetics*; D032322:Solanum / Q000378:metabolism*; D014867:Water / Q000378:metabolism
chemical_list: D012989:Soil Pollutants; D002104:Cadmium; D014867:Water; D002734:Chlorophyll